485 mm long, yes lady and gentlemen the new motherboard specially is made to have 8 full PCI-E 16x slots to your mining needs.
Taking a look at Colorfull's new mining motherboard all you see is pretty much the insane number of 6 pin power connectors to power this monstrosity. But to be honest the latest mining board from Colorfull does not seem all that appealing to me, but it might be targeted a customer who doesn't want to setup a large amount of pci-e 1x to 16x risers.
Atleast it's fun to look at. Other than the huge amount of 6 pins, 16x PCI-E slots the board is shaved down in other aspect to cut down cost.
Here is the full specifications
Colorful C.B250A-BTC Plus V20 motherboard specifications:
Intel LGA1151 CPUs
HDMI port
SO-DIMM slot
Support DDR4 2400/2133MHZ memory
PCIE3.0/USB2.0/SATA3.0/MSATA
On-board 1000M LAN chipset
1PCI Express 3.0×16 slot
7PCI Express x1 slots